This study was designed to characterize the patch-utilization strategies of two sympatric species of parasitoids. The hypothesis is presented that sympatric species that use the same range of hosts may exhibit divergent patch-utilization strategies, possibly allowing for coexistence. The species studied wereMuscidifurax raptorGirault&Saunders andM. zaraptorKogan&Legner, pupa parasites of synanthropic fly species in the southwestern United States. Laboratory behavior experiments demonstrated that these species have alternative strategies of patch utilization.M. raptorhas a short handling time and exhibits the apparent strategy of parasitizing as many hosts as possible per patch.M. zaraptorhas a longer handling time and generally enters a patch where it parasitizes a small number of hosts, before leaving quickly to search for other patches. Both strategies are accentuated at high parasitoid densities.